<template>
    <div class="tags" v-if="showTags">
        <ul>
            <li class="tags-li" v-for="(item,index) in tagsList" :class="{'active': isActive(item.path)}" :key="index"
            @contextmenu.prevent="openMenu($event,item)">
                <router-link :to="item.path" class="tags-li-title">{{item.title}}</router-link>
                <span class="tags-li-icon" @click="closeTags(index)">
                    <i class="el-icon-close"></i>
                </span>
            </li>
        </ul>
        <!-- <div class="tags-close-box">
            <el-dropdown @command="handleTags">
                <el-button size="mini" type="primary">
                    标签选项
                    <i class="el-icon-arrow-down el-icon--right"></i>
                </el-button>
                <template #dropdown>
                    <el-dropdown-menu size="small">
                        <el-dropdown-item command="other">关闭其他</el-dropdown-item>
                        <el-dropdown-item command="all">关闭所有</el-dropdown-item>
                    </el-dropdown-menu>
                </template>
            </el-dropdown>
        </div> -->
        
        <div v-show="visible" :style="{left:left+'px',top:top+'px'}" class="contextmenu">
            <el-dropdown @command="handleTags">
                <el-dropdown-menu size="small">
                    <el-dropdown-item command="refresh">刷新</el-dropdown-item>
                    <el-dropdown-item command="close">关闭</el-dropdown-item>
                    <el-dropdown-item command="closeLeft">关闭左侧</el-dropdown-item>
                    <el-dropdown-item command="closeRight">关闭右侧</el-dropdown-item>
                    <el-dropdown-item command="closeOther">关闭其他</el-dropdown-item>
                    <el-dropdown-item command="closeAll">关闭所有</el-dropdown-item>                    
                </el-dropdown-menu>
            </el-dropdown>
        </div>
    </div>
</template>

<script>
import { computed, ref, watch } from "vue";
import { useStore } from "vuex";
import { onBeforeRouteUpdate, useRoute, useRouter } from "vue-router";
export default {
    setup() {
        const route = useRoute();
        const router = useRouter();
        const isActive = (path) => {
            return path === route.fullPath;
        };

        const store = useStore();
        const tagsList = computed(() => store.state.tagsList);
        const showTags = computed(() => tagsList.value.length > 0);

        const visible = ref(false)
        const top = ref(0)
        const left = ref(0)

        // 关闭单个标签
        const closeTags = (index) => {
            const delItem = tagsList.value[index];
            store.commit("delTagsItem", { index });
            const item = tagsList.value[index]
                ? tagsList.value[index]
                : tagsList.value[index - 1];
            if (item) {
                delItem.path === route.fullPath && router.push(item.path);
            } else {
                router.push("/");
            }
        };

        // 设置标签
        const setTags = (route) => {
            const isExist = tagsList.value.some((item) => {
                return item.path === route.fullPath;
            });
            if (!isExist) {
                if (tagsList.value.length >= 15) {
                    store.commit("delTagsItem", { index: 0 });
                }
                store.commit("setTagsItem", {
                    name: route.name,
                    title: route.meta.title,
                    path: route.fullPath,
                });
            }
        };
        setTags(route);
        onBeforeRouteUpdate((to) => {
            setTags(to);
        });

        // 关闭全部标签
        const closeAll = () => {
            store.commit("clearTags");
            router.push("/");
        };
        // 关闭其他标签
        const closeOther = () => {
            const curItem = tagsList.value.filter((item) => {
                return item.path === route.fullPath;
            });
            store.commit("closeTagsOther", curItem);
        };
        // 关闭左侧标签
        const closeLeft = () => {
            store.commit("closeTagsLeft", {
                $router: router,
                $route: route
            });
        };
        // 关闭右侧标签
        const closeRight = () => {
            store.commit("closeTagsRight", {
                $router: router,
                $route: route
            });
        };
        //刷新当前标签
        const refresh = () => {   
            const fullPath  = route.fullPath
            router.replace({
                path: "/redirect" + fullPath
            });          
        }
        //关闭当前标签
        const close = () => {
            store.commit("closeCurrentTag", {
                $router: router,
                $route: route
            });
        }
        const handleTags = (command) => {
            if(command === "refresh") {
                refresh();
            }else if(command === "close"){
                close();
            }else if(command === "closeLeft"){
                closeLeft();
            }else if(command === "closeRight"){
                closeRight();
            }else if(command === "closeOther"){
                closeOther();
            }else if(command === "closeAll"){
                closeAll();
            }
        };

        // 关闭当前页面的标签页
        // store.commit("closeCurrentTag", {
        //     $router: router,
        //     $route: route
        // });

        const openMenu = (e, item) => {
            top.value = e.clientY + 5;
            left.value = e.clientX + 5;
            visible.value = true;
        }

        const closeMenu = () => {
            visible.value = false;
        }

        //观察visible的变化，来触发关闭右键菜单，调用关闭菜单的方法
        watch(visible,(newVal, oldVal) => {
            if (newVal) {
                document.body.addEventListener('click', closeMenu)
            } else {
                document.body.removeEventListener('click', closeMenu)
            }
        });

        return {
            isActive,
            tagsList,
            showTags,
            closeTags,
            handleTags,
            visible,top,left,openMenu,closeMenu,
        };
    },
};
</script>


<style>
.tags {
    position: relative;
    height: 30px;
    overflow: hidden;
    background: #fff;
    padding-right: 120px;
    box-shadow: 0 5px 10px #ddd;
}

.tags ul {
    box-sizing: border-box;
    width: 100%;
    height: 100%;
}

.tags-li {
    float: left;
    margin: 3px 5px 2px 3px;
    border-radius: 3px;
    font-size: 12px;
    overflow: hidden;
    cursor: pointer;
    height: 23px;
    line-height: 23px;
    border: 1px solid #e9eaec;
    background: #fff;
    padding: 0 5px 0 12px;
    vertical-align: middle;
    color: #666;
    -webkit-transition: all 0.3s ease-in;
    -moz-transition: all 0.3s ease-in;
    transition: all 0.3s ease-in;
}

.tags-li:not(.active):hover {
    background: #f8f8f8;
}

.tags-li.active {
    color: #fff;
}

.tags-li-title {
    float: left;
    max-width: 80px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    margin-right: 5px;
    color: #666;
}

.tags-li.active .tags-li-title {
    color: #fff;
}

.tags-close-box {
    position: absolute;
    right: 0;
    top: 0;
    box-sizing: border-box;
    padding-top: 1px;
    text-align: center;
    width: 110px;
    height: 30px;
    background: #fff;
    box-shadow: -3px 0 15px 3px rgba(0, 0, 0, 0.1);
    z-index: 10;
}

.contextmenu {
  margin: 0;
  background: #fff;
  z-index: 3000;
  position: fixed;
  list-style-type: none;
  padding: 0px 0;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 200;
  color: #333;
  box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, 0.3);
}

.contextmenu li {
  margin: 0;
  padding: 2px 16px;
  cursor: pointer;
}

.contextmenu li:hover {
  background-color: rgb(3, 125, 243);;
  color: white;
}
</style>
